Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom
GeoGebra
  • Home
  • Resources
  • Profile
  • Classroom
  • App Downloads

Triangle Sum Theorem

Author:Anthony DiLaura
Prove that the 3 interior angles of a triangle add to equal 180 degrees.

New Resources

  • רישום חופשי
  • Rule of Sarrus - Determinant of a 3×3 Matrix
  • Limaçons
  • Tracing an Ellipse Using Two Circles
  • The Geometry of the Coefficients of a Quadratic Function

Discover Resources

  • Tangent Properties
  • Dolphin Therapy Chi-Square Simulation
  • The volume of a triangular prism
  • sin x and cos x
  • Inscribed Angle Theorem Dance

Discover Topics

  • Symmetry
  • Tree Diagrams
  • Triangles
  • Parallelogram
  • Vectors 2D (Two-Dimensional)
AboutPartnersHelp Center
Terms of ServicePrivacyLicense
Graphing CalculatorCalculator SuiteMath Resources

Download our apps here:

Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917

© 2026 GeoGebra®